Question 476754
1. {{{sum((-1/2)^(n-1), n=1, infinity) = 1/(1-1/2)= 1/(1/2) = 2}}}


2.{{{sum(3*(0.4)^(n-1), n=1, infinity) = 3/(1-0.4)= 3/0.6 = 5}}}